X800 Pencil Vmod Question

[Spyd3r]

Hi everyone,

I've pencil voltmodded my vgpu, vdd, and vddq this past week and currently am sitting at the following:

R1597 - 372 Ohms from 420Ohms, I'm approximating 1.61v
Vdd - 2.18v
Vddq - 2.18v

Just tested it after installing the silencer (been on the card for 2 days now) and have a max temp of 53C. Have used the scan for artifacts on ATiTool for lots of hours now at the most recent clocks (more than 3-4 hours in total).

Results:
Core 531 -> 579
Mem 540 -> 549

With the stock cooler, I did notice temps climbed from 59C to about 70C after the vgpu mod.

I'm going to replace my 380W psu with the OCZ Powerstream 520W because after I modded the card, it seems to be taking much more power and sucking down the 12v rail.

Afterwhich I'm planning on going a little further on the vgpu, maybe up to 1.64v.

Anyone else done the mod? What resistance did you change the R1597 to?

Thanks.

Update: By lowering my vcore and cpu speed, Find Max in ATiTool gave me 552.00.

New Results:
Core 531 -> 579
Mem 540 -> 552

Off to test Max Core now.

[Styyn]

I don't recall the exact number I brought the resistance down to, but I do know I'm running 1.69v idle on water. Do you have 2.0 or 1.6 ram on that card? If it's 2.0 you're doing really well, but you might want to back off on the vdd volts some. I've got my vddq @ 2.17 idle and vdd @ 2.11 idle, and found that with anything over 2.12vdd my memory oc dropped off drastically due to artifacts. Try bringing it back down to 2.1-2.12 and you might be able to squeeze out some more mhz. Also keep in mind that your vgpu, vdd and vddq will *over*volt under load by ~.01v.

I'm also curious what your ambient is and what you're using to get your "full load" temp. 53c on air with that speed and those volts is what piques my curiousity. I'm on much better than average water and still hit 50-51c when I max out the card for three or four hours.

[Spyd3r]

Thanks for replying.

Hmm...right now I'm running find max core with ATiTool and that's where I get my max temps from. I find that my temps are quite a bit lower so ATiTool is the only place I take max temps from. Also I've run it quite a few times today searching for a 1 hour stable clock. It seems to be hitting 54C once in a long while now though.

The readings ATiTool is giving me right now is 53C/44C and I'm currently using "Find Max Core". My room temp I think is pretty low (lower than 20C I think). Case temp is showing 26C (reading from AsusProbe).

I guess the Silencer is doing it's job really well. My other Asus AX800Pro that I sold to my friend did 564mhz on its memory stock voltage with the Silencer on and the Silencer did lower temps by like 10C compared to the stock hsf at 100% on the other card. So now I'm pretty surprised that it's been able to pull the temps of a pretty highly overvolted card down to 53C from a peak that I was getting with the stock fan at 100% of almost 70C. Bear in mind that my former x800 was tested during the summer and this one now winter. Also silencer is being run at 100% as well.

So basically in conclusion, I'm guessing it must be my room temps and the silencer that are helping the temps stay low.

Oh and it's 2.0ns ram on this card. X800Pro Non-vivo (mistake not buying vivo (I was a newbie at the time :rolleyes: ))